Click Add Account.You will have a success message saying the email was added. You can set the email to send as well.Note! If you do not want to send through Gmail, click the No radio button. You don't need to follow the next steps.

If you want to send through Gmail, select Yes and Click Next Step.Enter your Name.Click Next Step.

Now, Gmail will email a verification code to the address you just added. Check your domains email for a message Gmail sent you. Click the link in the email, or Enter the code into the text box and click Verify.Enter the code into the text box and click Verify. Now you will see your Domains email address in the Send Email As and the Check mail from other accounts section.